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Steel and Composite Structures
  Volume 45, Number 2, October 2022 , pages 193-204

Effect of the GFRP wrapping on the shear and bending Behavior of RC beams with GFRP encasement
Yasin Onuralp Ozkilic, Lokman Gemi, Emrah Madenci, Ceyhun Aksoylu and Ilker Kalkan

    The need for establishing the contribution of pultruded FRP encasements and additional FRP wraps around these encasements to the shear strength and load-deflection behavior of reinforced concrete beams is the main motivation of the present study. This paper primarily focuses on the effect of additional wrapping around the composite beam on the flexural and shear behavior of the pultruded GFRP (Glass Fiber Reinforced Polymer) beams infilled with reinforced concrete, taking into account different types of failure according to av/H ratio (arch action, shear-tension, shear-compression and pure bending). For this purpose, nine hybrid beams with variable shear span-to-depth ratio (av/H) were tested. Hybrid beams with 500 mm, 1000 mm, and 1500 mm lengths and cross-sections of 150x100 mm and 100x100 mm were tested under three-point and four-point loading. Based on the testing load-displacement relationship, ductility ratio, energy dissipation capacity of the beams were evaluated with comprehensive macro damage analysis on pultruded GFRP profile and GFRP wrapping. The GFRP wraps were established to have a major contribution to the composite beam ductility (90-125%) and strength (40-75%) in all ranges of beam behavior (shear-dominated or dominated by the coupling of shear and flexure). The composite beams with wraps were showns to reach ductilities and strength values of their counterparts with much greater beam depth.
Key Words
    pultruded GFRP; GFRP wrapping; composite; hybrid beam; reinforced concrete
Yasin Onuralp Ozkilic and Emrah Madenci:Department of Civil Engineering, Necmettin Erbakan University, 42100, Konya, Turkey

Lokman Gemi:Meram Vocational School, Necmettin Erbakan University, 42100, Konya, Turkey

Ceyhun Aksoylu:Department of Civil Engineering, Konya Technical University, 42130, Konya, Turkey

Ilker Kalkan:Department of Civil Engineering, Kirikkale University, 71450 Kirikkale, Turkey

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